US5662752A - Pneumatic tires with centrally protruding inclined belt layer - Google Patents

Pneumatic tires with centrally protruding inclined belt layer Download PDF

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Publication number
US5662752A
US5662752A US08/572,489 US57248995A US5662752A US 5662752 A US5662752 A US 5662752A US 57248995 A US57248995 A US 57248995A US 5662752 A US5662752 A US 5662752A
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US
United States
Prior art keywords
belt
belt layer
circumferential
center portion
side portions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/572,489
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English (en)
Inventor
Tatsuo Nakano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
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Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Assigned to BRIDGESTONE CORPORATION reassignment BRIDGESTONE CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NAKANO, TATSUO
Application granted granted Critical
Publication of US5662752A publication Critical patent/US5662752A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
    • B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
    • B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
    • B60C2009/2219—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre with a partial zero degree ply at the belt edges - edge band
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T152/00—Resilient tires and wheels
    • Y10T152/10—Tires, resilient
    • Y10T152/10495—Pneumatic tire or inner tube
    • Y10T152/10765—Characterized by belt or breaker structure

Definitions

  • This invention relates to pneumatic tires, especially to tires where a carcass is reinforced by a circumferential belt layer comprising reinforcing elements extending in straight, waved, or zigzag manner substantially along the tire circumference.
  • Japanese Patent Laid Open No. 60-22504 discloses a tire having the circumferential belt layer comprising reinforcing elements having a Young's modulus of not less than 2500 kgf/mm 2 whereby the circumferential rigidity is enhanced and separation failure at the belt ends is prevented.
  • the elements of the circumferential belt layer are disposed substantially along the circumferential direction of the tire, the elements are tensioned and lengthened in the circumferential direction in the ground contacting area.
  • the diameter of both tread side portions is less than that of the tread center portion, the diameter of both tread side portions is necessarily expanded, so that the reinforcing elements are considerably lengthened. That is, since the reinforcing elements at the side end portions of the circumferential belt layer are lengthened repeatedly in the circumferential direction during rotation of the tire, the reinforcing elements are apt to be broken at the side end portions of the circumferential belt layer. This is a disadvantage of a belt provided with a circumferential belt layer.
  • An object of the present invention is to prevent the disadvantage caused by providing a circumferential belt layer, in particular breaking of the elements at the edge portions of the circumferential belt layer, and to provide a pneumatic tire having strengthened circumferential rigidity.
  • the present invention provides a pneumatic tire comprising a belt and a tread disposed radially outside of a toroidal carcass extending between a pair of beads, wherein the belt comprises at least one circumferential belt layer having rubber coated reinforcing elements extending substantially along the circumferential direction of the tire and at least one included belt layer having rubber coated reinforcing elements extending at an angle with respect to the tire equatorial plane, and wherein at least one said inclined belt layer protrudes radially outwardly at the center portion in the widthwise direction of the belt with respect to both its side portions.
  • the circumferential belt layer(s) are disposed on both side portions of the inclined belt layer(s) except for the center portion in the widthwise direction.
  • the belt includes at least two circumferential belt layers, and at least one radially inner circumferential belt layer is disposed on both side portions of the inclined belt layer(s) except for the center portion in the widthwise direction while at least one radially outer circumferential belt layer is disposed continuously along the widthwise direction.
  • the reinforcing elements of the circumferential belt layer can be a waved-shaped or zigzag-shaped cord or monofilament as well as a conventional straight cord or monofilament that is disposed in the circumferential direction, and can be a spirally wound ribbon comprising a plurality of cords or monofilaments coated with rubber.
  • FIG. 1 is a widthwise cross-section of a pneumatic tire according to this invention
  • FIG. 2 is an enlarged cross-section of a belt structure according to this invention.
  • FIG. 3 is an enlarged cross-section of another belt structure according to this invention.
  • FIG. 4 is a cross-section of a conventional belt structure.
  • FIG. 1 is a cross-section of a typical tire according to this invention.
  • This pneumatic tire comprises a carcass 2 extending between a pair of beads 1, a belt 3 comprising at least one slant belt layer 5a, 5b and at least one circumferential belt layer 6a, 6b, and a tread 4.
  • the belt 3 consists of two inclined belt layers 5a, 5b disposed outside of the carcass 2 and two circumferential belt layers 6a, 6b disposed on both side portions of the inclined belt layers except for the center portion in the widthwise direction.
  • the inclined belt layers 5a, 5b are disposed such that the center portion C in the widthwise direction is projected radially outwards with respect to the remaining side portions S thereof.
  • the diameter of the inclined belt layers varies in the widthwise direction such that the diameter of the center portion C is larger than that of an imaginary line connecting both side portions S.
  • the center portion C of the inclined belt layers is a region that extends from the mid-equatorial plane of the tire toward each side by 10-40% of the maximum width of the inclined belt layers, and a part or the entirety of this center portion is disposed outside of the side portions S.
  • two inclined belt layers are thus projected radially outwardly at the center portion, but according to the invention only one such inclined belt layer can be thus projected.
  • the belt 3 is not limited to the structure as shown in FIG. 1 and may have a structure as shown in FIG. 2 or FIG. 3.
  • FIG. 2 shows a belt consisting of a single circumferential belt layer 6 disposed on the side portions S of the slant belt layers 5a, 5b.
  • FIG. 3 shows a belt consisting of inclined belt layers 5a, 5b protruding outwards in the radial direction at the center portion C, and circumferential belt layers 6a, 6b in which the radially outer layer 6b is disposed continuously along the widthwise direction.
  • the inventor has studied means for relaxing the tension at the side end portions of the circumferential belt layer because the concentration of the tension at the side end portions of the circumferential belt layer causes stretching of the reinforcing elements at such portions. That is, the inventor carried out investigations based on the idea that, when the belt extending in the circumferential direction is considered as a beam, it is possible to relax the stretch concentrating at the reinforcing elements of the circumferential belt layer at the side end portions by changing the position of the neutral axis where neither stretch nor compression arises in lateral cross-section (cross-section in the widthwise direction of the tire). In particular, when the position of the neutral axis is shifted radially outside toward the circumferential belt layer, the stretching of the circumferential belt layer is made small.
  • the shape of the belt layer in the widthwise cross-section which was considered as a beam, was studied.
  • it is difficult to change the shape of the circumferential belt layer because the circumferential belt layer is given a constraint such that the circumferential belt layer has a hooping effect function and a certain spacing between the circumferential belt layer and the bottom of a groove in the tread needs to be retained.
  • it is easier to change the shape of the inclined belt because of comparatively less constraint.
  • the center portion C of the inclined belt layer When at least a part or the whole of the center portion C of the inclined belt layer is disposed radially outwardly with respect to the side portions S, the above-mentioned effect of restraining the stretching of the reinforcing elements can be obtained. Furthermore, it is more effective that the center portion C is disposed to be protruded with respect to the side portions S in the radial direction by a distance equal to or larger than the diameter of the reinforcing elements of the inclined belt layer.
  • the belt structure of the embodiment shown in FIG. 3 has the advantage of avoiding the breaking of the reinforcing elements because the number of the reinforcing elements of steel cords in the circumferential belt layers is larger than that of the tire shown in FIG. 1 or FIG. 2.
  • One circumferential belt layer continuously extends in the widthwise direction of the belt, although this structure is disadvantageous with respect to reducing the tire weight.
  • This embodiment is based on an idea that it is possible to largely transfer the neutral axis of the belt toward the tread by disposing the circumferential belt layer having much larger circumferential rigidity than the inclined belt layer radially outside (in the tread) of the projected center portion of the inclined belt layer as well as by projecting the inclined belt layer.
  • An experiment with respect to measurement of the belt stretching and a running test on a drum showed that this idea is correct.
  • the weight of the tire increases, resulting in the disadvantage of degrading rolling resistance and so on. Therefore, the belt structure of this embodiment is useful for enhancing durability of the belt under circumstances wherein increasing the weight of the tire is permitted.
  • the circumferential belt layer comprises wave-shaped (wave length: 36.6 mm, amplitude: 1.3 mm) steel cords having a structure of 3+9 ⁇ 0.19 mm (0.8 mm ⁇ ) at a density of 28 ends/50 mm
  • the inclined belt layer comprises steel cords having a structure of 3+9+15 ⁇ 0.23 mm (1.4 mm ⁇ ) and disposed at an angle of 18° with respect to the equatorial plane at a density of 23 ends/50 mm.
  • the width of the center portion C of the inclined belt layer is 70 mm and the width of the side portions S is also 70 mm.
  • the entire center portion C is projected with respect to both side portions S by a distance in the radial direction of 3.0 mm in the tire of FIG. 1, 1.5 mm in the tire of FIG. 2, and 1.5 mm in the tire of FIG. 3.
  • a comparable tire having a conventional belt structure as shown in FIG. 4 and having the same size was also manufactured.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
US08/572,489 1994-12-27 1995-12-14 Pneumatic tires with centrally protruding inclined belt layer Expired - Fee Related US5662752A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP6325458A JPH08175107A (ja) 1994-12-27 1994-12-27 空気入りタイヤ
JP6-325458 1994-12-27

Publications (1)

Publication Number Publication Date
US5662752A true US5662752A (en) 1997-09-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
US08/572,489 Expired - Fee Related US5662752A (en) 1994-12-27 1995-12-14 Pneumatic tires with centrally protruding inclined belt layer

Country Status (5)

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US (1) US5662752A (cs)
EP (1) EP0719659B1 (cs)
JP (1) JPH08175107A (cs)
DE (1) DE69504946T2 (cs)
ES (1) ES2122461T3 (cs)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5904197A (en) * 1996-01-19 1999-05-18 Pirelli Coordinamento Pneumatici S.P.A. Radial tire for motor vehicles with a belt structure including side straps
US6401778B1 (en) 1997-11-05 2002-06-11 Compagnie Generale Des Establissements Michelin-Michelin & Cie Crown reinforcement for heavy duty tires
US6470939B1 (en) 1998-05-11 2002-10-29 Campagnie Generale Des Etablissements Michelin - Michelin & Cie Radial tire with crown reinforcement including radial ply
US6637487B2 (en) * 1999-12-22 2003-10-28 Sumitomo Rubber Industries, Ltd. Pneumatic tire
US6659147B1 (en) * 1997-11-05 2003-12-09 Compagnie Generale Des Etablissements Michelin-Michelin & Cie Tire crown reinforcement
US20090038732A1 (en) * 2005-06-30 2009-02-12 Gaelle Netzer Tire For Heavy Vehicles
US20090078356A1 (en) * 2005-06-30 2009-03-26 Michelin Recherche Et Technique S.A. Tire For Heavy Vehicles
US20090084485A1 (en) * 2005-06-30 2009-04-02 Michelin Recherche Et Technique S.A. Tire For Heavy Vehicles
US20090114331A1 (en) * 2005-06-30 2009-05-07 Michelin Recherche Et Technique S.A. Tire For Heavy Vehicles
US20090120552A1 (en) * 2005-06-30 2009-05-14 Jean Coue Tire For Heavy Vehicles
US20090126848A1 (en) * 2005-06-30 2009-05-21 Jean Coue Tire for Heavy Vehicles
US20090139628A1 (en) * 2005-06-30 2009-06-04 Jean Coue Tire For Heavy Vehicles
EP2509802A1 (en) 2009-12-11 2012-10-17 PIRELLI TYRE S.p.A. Tyre for a wheel of a heavy load vehicle
US20150136296A1 (en) * 2012-07-13 2015-05-21 The Yokohama Rubber Co., Ltd. Pneumatic Tire
US20150165822A1 (en) * 2012-07-13 2015-06-18 The Yokohama Rubber Co., Ltd. Pneumatic Tire
US20150273947A1 (en) * 2012-10-10 2015-10-01 The Yokohama Rubber Co., Ltd. Pneumatic Tire
US9862232B2 (en) 2011-05-31 2018-01-09 Pirelli Tyre S.P.A. Pneumatic tyre for heavy load vehicle wheels

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6315019B1 (en) 1998-02-19 2001-11-13 Pirelli Pneumatici S.P.A. Tire with belt structure including a pair of lateral bands
JP5620191B2 (ja) * 2010-08-12 2014-11-05 株式会社ブリヂストン 空気入りタイヤ
FR3022838B1 (fr) * 2014-06-26 2016-06-10 Michelin & Cie Pneumatique comportant une couche d'elements de renforcement circonferentiels
FR3057810A1 (fr) * 2016-10-21 2018-04-27 Compagnie Generale Des Etablissements Michelin Pneumatique a couches de travail comprenant une architecture optimisee
FR3057812A1 (fr) * 2016-10-21 2018-04-27 Compagnie Generale Des Etablissements Michelin Pneumatique comprenant une architecture optimisee
JP7484200B2 (ja) * 2020-02-06 2024-05-16 住友ゴム工業株式会社 タイヤ

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6022504A (ja) * 1983-07-14 1985-02-05 Toyo Tire & Rubber Co Ltd 重荷重車両用ラジアルタイヤ
US4883108A (en) * 1987-09-24 1989-11-28 The Yokohama Rubber Co., Ltd. Heavy-duty pneumatic radial tire
JPH0292704A (ja) * 1988-09-27 1990-04-03 Bridgestone Corp 空気入りタイヤ
JPH0292703A (ja) * 1988-09-27 1990-04-03 Bridgestone Corp 空気入りタイヤ
US5004031A (en) * 1988-03-09 1991-04-02 Bridgestone Corp. Pneumatic tire with a strip reinforcing laminate having filaments arranged together in an undulating form
EP0425318A2 (en) * 1989-10-27 1991-05-02 Bridgestone Corporation Pneumatic radial tires
JPH0558113A (ja) * 1991-08-27 1993-03-09 Bridgestone Corp 空気入りラジアルタイヤ
JPH06219106A (ja) * 1993-01-25 1994-08-09 Bridgestone Corp 空気入りタイヤ

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6022504A (ja) * 1983-07-14 1985-02-05 Toyo Tire & Rubber Co Ltd 重荷重車両用ラジアルタイヤ
US4883108A (en) * 1987-09-24 1989-11-28 The Yokohama Rubber Co., Ltd. Heavy-duty pneumatic radial tire
US5004031A (en) * 1988-03-09 1991-04-02 Bridgestone Corp. Pneumatic tire with a strip reinforcing laminate having filaments arranged together in an undulating form
JPH0292704A (ja) * 1988-09-27 1990-04-03 Bridgestone Corp 空気入りタイヤ
JPH0292703A (ja) * 1988-09-27 1990-04-03 Bridgestone Corp 空気入りタイヤ
EP0425318A2 (en) * 1989-10-27 1991-05-02 Bridgestone Corporation Pneumatic radial tires
JPH0558113A (ja) * 1991-08-27 1993-03-09 Bridgestone Corp 空気入りラジアルタイヤ
JPH06219106A (ja) * 1993-01-25 1994-08-09 Bridgestone Corp 空気入りタイヤ

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5904197A (en) * 1996-01-19 1999-05-18 Pirelli Coordinamento Pneumatici S.P.A. Radial tire for motor vehicles with a belt structure including side straps
US6401778B1 (en) 1997-11-05 2002-06-11 Compagnie Generale Des Establissements Michelin-Michelin & Cie Crown reinforcement for heavy duty tires
US6659147B1 (en) * 1997-11-05 2003-12-09 Compagnie Generale Des Etablissements Michelin-Michelin & Cie Tire crown reinforcement
US6470939B1 (en) 1998-05-11 2002-10-29 Campagnie Generale Des Etablissements Michelin - Michelin & Cie Radial tire with crown reinforcement including radial ply
US6637487B2 (en) * 1999-12-22 2003-10-28 Sumitomo Rubber Industries, Ltd. Pneumatic tire
US7987883B2 (en) 2005-06-30 2011-08-02 Michelin Recherche Et Technique S.A. Tire for heavy vehicles
US8322392B2 (en) 2005-06-30 2012-12-04 Compagnie Generale Des Etablissements Michelin Tire for heavy vehicles
US20090084485A1 (en) * 2005-06-30 2009-04-02 Michelin Recherche Et Technique S.A. Tire For Heavy Vehicles
US20090114331A1 (en) * 2005-06-30 2009-05-07 Michelin Recherche Et Technique S.A. Tire For Heavy Vehicles
US20090120552A1 (en) * 2005-06-30 2009-05-14 Jean Coue Tire For Heavy Vehicles
US20090126848A1 (en) * 2005-06-30 2009-05-21 Jean Coue Tire for Heavy Vehicles
US20090139628A1 (en) * 2005-06-30 2009-06-04 Jean Coue Tire For Heavy Vehicles
US20090038732A1 (en) * 2005-06-30 2009-02-12 Gaelle Netzer Tire For Heavy Vehicles
US8016006B2 (en) 2005-06-30 2011-09-13 Michelin Recherche Et Technique S.A. Tire for heavy vehicles
US8091599B2 (en) * 2005-06-30 2012-01-10 Michelin Recherche Et Technique S.A. Tire for heavy vehicles
US8413698B2 (en) * 2005-06-30 2013-04-09 Michelin Recherche Et Technique S.A. Tire for heavy vehicles
US20090078356A1 (en) * 2005-06-30 2009-03-26 Michelin Recherche Et Technique S.A. Tire For Heavy Vehicles
EP2509802A1 (en) 2009-12-11 2012-10-17 PIRELLI TYRE S.p.A. Tyre for a wheel of a heavy load vehicle
EP2509802B1 (en) * 2009-12-11 2016-05-04 Pirelli Tyre S.p.A. Tire for a heavy duty vehicle
US9862232B2 (en) 2011-05-31 2018-01-09 Pirelli Tyre S.P.A. Pneumatic tyre for heavy load vehicle wheels
US20150136296A1 (en) * 2012-07-13 2015-05-21 The Yokohama Rubber Co., Ltd. Pneumatic Tire
US20150165823A1 (en) * 2012-07-13 2015-06-18 The Yokohama Rubber Co., Ltd. Pneumatic tire
US20150165822A1 (en) * 2012-07-13 2015-06-18 The Yokohama Rubber Co., Ltd. Pneumatic Tire
US9604503B2 (en) * 2012-07-13 2017-03-28 The Yokohama Rubber Co., Ltd. Pneumatic tire
US9783003B2 (en) * 2012-07-13 2017-10-10 The Yokohama Rubber Co., Ltd. Pneumatic tire
US20150273947A1 (en) * 2012-10-10 2015-10-01 The Yokohama Rubber Co., Ltd. Pneumatic Tire
US10406863B2 (en) * 2012-10-10 2019-09-10 The Yokohama Rubber Co., Ltd. Pneumatic tire

Also Published As

Publication number Publication date
EP0719659B1 (en) 1998-09-23
JPH08175107A (ja) 1996-07-09
EP0719659A2 (en) 1996-07-03
DE69504946D1 (de) 1998-10-29
DE69504946T2 (de) 1999-07-15
ES2122461T3 (es) 1998-12-16
EP0719659A3 (cs) 1996-07-10

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